Quantitative analysis of contact line behaviors of evaporating binary mixture droplets using surface plasmon resonance imaging

Jeong, Chan Ho; Lee, Hyung Ju; Kim, Dae Yun; Ahangar, Shahab Bayani; Choi, Chang Kyoung; Lee, Seong Hyuk

doi:10.1016/j.ijheatmasstransfer.2020.120690

Cited by 19 publications

(18 citation statements)

References 40 publications

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“…The conductive heat transfer along the multi-layer, including a droplet and pNIPAM solution, is written as where Javg is the averaged evaporation flux, and l is the width of the ETF. This approach is also adopted for the binary mixture droplet by Jeong et al [32]. The theoretical results of evaporation flux and averaged evaporation flux at the contact line region are used as the boundary condition to calculate the solid-liquid interface temperature of the droplet.…”

Section: Resultsmentioning

confidence: 99%

Solid–Liquid Interface Temperature Measurement of Evaporating Droplet Using Thermoresponsive Polymer Aqueous Solution

et al. 2021

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The present study aims to measure the solid–liquid interface temperature of an evaporating droplet on a heated surface using a thermoresponsive polymer. Poly(N-isopropylacrylamide) (pNIPAM) was used owing to its sensitive optical and mechanical properties to the temperature. We also measured the refractive index variation of the pNIPAM solution by using the surface plasmon resonance imaging (SPRi). In particular, the present study proposed a new method to measure the solid–liquid interface temperature using the correlation among reflectance, refractive index, and temperature. It was found that the reflectance of a pNIPAM solution decreased after the droplet deposition. The solid–liquid interface temperature, estimated from the reflectance, showed a lower value at the center of the droplet, and it gradually increased along the radial direction. The lowest temperature at the contact line region is present because of the maximum evaporative cooling. Moreover, the solid–liquid interface temperature deviation increased with the surface temperature, which means solid–liquid interface temperature should be considered at high temperature to predict the evaporation flux of the droplet accurately.

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Section: Resultsmentioning

confidence: 99%

Solid–Liquid Interface Temperature Measurement of Evaporating Droplet Using Thermoresponsive Polymer Aqueous Solution

et al. 2021

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“…The evaporation rate of each component is inevitably different due to its volatility. This phenomenon is called "selective evaporation," in which the more volatile component evaporates faster because it has a higher saturation vapor pressure [27][28][29]. For example, in an ethanol-water BMD, the ethanol component is more volatile due to its higher saturation vapor pressure.…”

Section: Selective Evaporation Dynamicsmentioning

confidence: 99%

“…Meanwhile, Jeong et al [29] performed the in situ measurements of the concentration distribution of evaporating ethanolwater BMDs. They utilized surface plasmon resonance (SPR) to determine the temporal and spatial changes of ethanol concentrations.…”

Section: Authorsmentioning

confidence: 99%

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Review of the binary mixture droplet evaporation studies

et al. 2021

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Understanding the evaporation characteristics of sessile binary mixture droplets (BMDs) is crucial in various industries, such as surface coating, ink-jet printing, evaporators, fuel combustion, and medical diagnosis. The underlying physics of BMDs has not yet been fully explored despite numerous prior studies. This paper reviews the recent studies on evaporating BMD and examines various studied and unaddressed issues. First, we introduce measurement techniques to estimate time-varying mixture concentrations of BMDs during evaporation. Next, the theoretical models that have been developed to predict selective evaporation dynamics of BMDs are reviewed and summarized. Finally, this paper reviews the recent studies that have examined the three distinct stages of the contact line motion and internal flows of BMDs.

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“…The rotation direction is reversed upon reflection, and thus, the nonzero angular momentum is transferred to the trapped bead resolution of single micrometers. There exist a few methods of studying fluid flows with comparable or greater resolution, such as micro-particle image velocimetry (Lindken 2009, Wereley 2010, surface plasmon resonance (Ahangar 2020, Jeong 2021, micro-laser Doppler velocimetry (Czarske 2015), positron emission particle tracking (Langford 2016), NRM (Lee 2001) andMRI (Elkins 2007). Most of these techniques require advanced research equipment and are limited to specific experimental conditions (in terms of substrate, substances and physical properties).…”

Section: Introductionmentioning

confidence: 99%

Microscale solute flow probed with rotating microbead trapped in optical vortex

2021

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The dynamics of solute flow in the microscopic chamber can be studied with optical tweezers. A method based on the metallic microbeads trapped in the focused optical vortex beam is proposed. This annular beam of a twisted wavefront exerts torque on a reflective object placed inside the dark core of the vortex. The induced rotational movement of the bead is sensitive to local viscosity changes in the surrounding medium, for example, during the ongoing dissolution process. Two experimental configurations are described, both relying on tracing the angular velocity of the bead in time. In one-bead configuration, the dynamics of local solute concentration can be studied. In two-bead case, the direction and speed of solute flow can be probed with a spatial resolution of single micrometers. We approach the elementary problem of sucrose dissolution and diffusion in water. The surprising impression of the reverse solute flow was observed. Further experimental investigation led to the discovery that this phenomenon originates from the sucrose stream-like diffusion in the mid-depth of the measurement chamber. The rotating microbead method applies for various solid and liquid substances and may become a useful technique for microfluidics research. Graphic abstract

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Quantitative analysis of contact line behaviors of evaporating binary mixture droplets using surface plasmon resonance imaging

Cited by 19 publications

References 40 publications

Solid–Liquid Interface Temperature Measurement of Evaporating Droplet Using Thermoresponsive Polymer Aqueous Solution

Solid–Liquid Interface Temperature Measurement of Evaporating Droplet Using Thermoresponsive Polymer Aqueous Solution

Review of the binary mixture droplet evaporation studies

Microscale solute flow probed with rotating microbead trapped in optical vortex

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